Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Zhang, Yiteng; Zuo, Lian; Yang, Jaekyung; Cai, Xun; Zhao, Yan Lin; Zeng, Xiangxiong

doi:10.1002/suco.201900016

Cited by 12 publications

(5 citation statements)

References 30 publications

(35 reference statements)

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“…This would lead to consistently hypothesize that the measured and calculated recovery of mechanical performance is attributable not only to a reconstruction of the physical through-crack continuity of the cementitious matrix, but also to the positive benefit induced by the healing at the level of fiber-matrix interface, as widely verified in the literature [40]. This last effect is likely to be better promoted by the crystalline admixture, also through its well-assessed pore refinement and matrix densification effect [41][42][43].…”

Section: Correlation Between Indices Of Mechanical Recovery and Index Of Crack Sealingmentioning

confidence: 79%

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

et al. 2021

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Chloride diffusion and penetration, and consequently chloride-induced corrosion of reinforcement, are among the most common mechanisms of deterioration of concrete structures, and, as such, the most widely and deeply investigated as well. The benefits of using Ultra-High Performance (Fiber-Reinforced) Concrete—UHP(FR)C to extend the service life of concrete structures in “chloride attack” scenarios have been addressed, mainly focusing on higher “intrinsic” durability of the aforementioned category of materials due to their compact microstructure. Scant, if nil, information exists on the chloride diffusion and penetration resistance of UHPC in the cracked state, which would be of the utmost importance, also considering the peculiar (tensile) behavior of the material and its high inborn autogenous healing capacity. On the other hand, studies aimed at quantifying the delay in chloride penetration promoted by self-healing, both autogenous and autonomous, of cracked (ordinary) concrete have started being promoted, further highlighting the need to investigate the multidirectional features of the phenomenon, in the direction both parallel and orthogonal to cracks. In this paper, a tailored experimental methodology is presented and validated to measure, with reference to its multidirectional features, the chloride penetration in cracked UHPC and the effects on it of self-healing, both autogenous and stimulated via crystalline admixtures. The methodology is based on micro-core drilling in different positions and at different depths of UHPC disks cracked in splitting and submitted to different exposure/healing times in a 33g/L NaCl aqueous solution. Its validation is completed through comparison with visual image analysis of crack sealing on the same specimens as well as with the assessment of crack sealing and of mechanical and permeability healing-induced recovery performed, as previously validated by the authors, on companion specimens.

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Section: Correlation Between Indices Of Mechanical Recovery and Index Of Crack Sealingmentioning

confidence: 79%

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

et al. 2021

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“…Cementitious capillary crystalline waterproofing (CCCW) material is a kind of rigid waterproof material which is composed of ordinary Portland cement, fine quartz sand (or silica sand) as the base material and mixed with active chemicals. Cementitious Capillary Crystalline Active Masterbatch (CCCAM) is the active ingredient from CCCW and can penetrate into the cement matrix through the carrier of moisture and react with hydration products to form crystalline or gelatinous substances which fill the capillary pores and micro cracks [22][23][24]. The main application of CCCW material is to improve the densification, impermeability, and self-healing capability of concrete structures.…”

Section: Impermeable Concrete Additivementioning

confidence: 99%

Investigation on Moisture Damage Prevention of a Spherical Hinge Structure of a Swivel Bridge

Guo

Wang³

et al. 2020

Coatings

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As a key component of a swivel bridge, the spherical hinge is a steel-concrete structure, which is susceptible to moisture damage during waiting time. In this paper, spherical hinge moisture damage prevention is investigated comprehensively from two aspects of impermeable concrete and steel-concrete interface waterproof coating. Three impermeable concretes were prepared and tested by the compressive strength test, splitting tensile test, four-point bending test and the impermeability test. The test results illustrated that addition of cementitious capillary crystalline active masterbatch (CCCAM) and polypropylene fiber (PP) could improve the toughness and brittleness of concrete. The addition of CCCAM was an effective technique for improving the permeability of concrete. However, the incorporation of PP and CCCAM at the same time cannot improve the impermeability of concrete. This may be because the chaotic support structure formed by PP prevents the infiltration and uniform dispersion of CCCAM. A waterproof coating consolidation performance test was proposed to quantify the interface bond strength of waterproof coatings and assess the impact of temperature, moisture and freeze-thawing cycles on consolidation performance of waterproof coatings. The test results showed that temperature had a significant effect on the interface consolidation property of waterproof coatings and the optimal dosage of SBS modified asphalt (SBS), polyurethane (PLT) and unsaturated polyester resin (UPLS) waterproof coating is 1.18kg/m2, 0.95kg/m2 and 1.15kg/m2, respectively. Moreover, it was found that PLS waterproof coating maintained excellent properties in complex environment. This is because PLS has excellent shear strength and rubber characteristics, and it can form a hard–soft–hard transition layer between the concrete and steel, reducing the impact of environmental factors.

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“…The active substances in CAs promote the hydration of cement to produce more hydration products such as ettringite, which improves the mechanical properties of CBMs [20]. In addition, the incorporation of CAs improves the impermeability of CBMs because the pore structure is improved and the pores are filled with a large amount of ettringite and CaCO 3 [21]. Although CAs have been widely used to strengthen CBMs, the self-healing ability of CBMs with CAs has not been systematically studied, especially the effect of the component and content of substances in CAs on the mechanical properties and water impermeability of mortar.…”

Section: Introductionmentioning

confidence: 99%

“…An efficient and cost-effective method for studying multiple factors and levels is the orthogonal experiment, which is commonly used in scientific research across various fields [19][20][21]. Jiang et al utilized orthogonal experimental design to prepare a modified soil composite material and determine the component content that exhibited excellent hygroscopicity [22].…”

Section: Introductionmentioning

confidence: 99%

Self-healing properties of mortar with crystalline admixture: experimental investigation and parameter optimization

Liu,

Liang,

Jiang

et al. 2024

Smart Mater. Struct.

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The inclusion of crystalline admixture (CA) is a highly effective method for enhancing the self-healing properties of mortar. This study examined the complexing abilities of different complexing agents under varying temperatures, pH levels, and ion species in order to select effective complexing agents for diverse environments, as complexing agents play a crucial role in CAs. After determining the type of complexing agent, an orthogonal array design was used to optimize the components of CA, and the strengthening mechanism of CA for mortar was discussed through microstructure analysis. The results showed that the complexation behavior of triethanolamine (TEA) and glycine performed better than sodium citrate (SC) for different pH levels, temperatures, and ion species. Meanwhile, TEA and glycine showed complementarity at different stages, so TEA and glycine were used as complexing agents in this study. Based on the orthogonal experiment, the optimal contents of Na2SiO3, Na2CO3, TEA, glycine, Ca(COOH)2, and nano-SiO2 in CA were determined to be 1.0%, 1.0%, 0.04%, 1.0%, 0.5%, and 1.0%, respectively. Under the synergistic effect of TEA and glycine, the hydration of aluminate and ferrialuminate was accelerated, and the hydration degree of cement paste was increased. At 28 d, the contents of CaCO3, C-S-H gel, and ettringite of cement paste with CA were higher than these of plain paste, but its Ca(OH)2 content was lower. Although the Ca(OH)2 content in the cement paste with CA was lower, the Ca(OH)2 crystal structure filled in the pores was larger. Therefore, the mortar mixed with CA exhibited higher compressive strength, water impermeability, and self-healing ability.

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Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Cited by 12 publications

References 30 publications

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

Effects of Autogenous and Stimulated Self-Healing on Durability and Mechanical Performance of UHPFRC: Validation of Tailored Test Method through Multi-Performance Healing-Induced Recovery Indices

Investigation on Moisture Damage Prevention of a Spherical Hinge Structure of a Swivel Bridge

Self-healing properties of mortar with crystalline admixture: experimental investigation and parameter optimization

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